JPH10244210A - Coating method - Google Patents
Coating methodInfo
- Publication number
- JPH10244210A JPH10244210A JP4748397A JP4748397A JPH10244210A JP H10244210 A JPH10244210 A JP H10244210A JP 4748397 A JP4748397 A JP 4748397A JP 4748397 A JP4748397 A JP 4748397A JP H10244210 A JPH10244210 A JP H10244210A
- Authority
- JP
- Japan
- Prior art keywords
- paint
- coating
- water
- isocyanate
- dispersed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、塗装時に排出され
る有機溶剤量を少なくした塗料の塗装方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a coating material in which the amount of organic solvent discharged during coating is reduced.
【０００２】[0002]
【従来の技術】近年、地球環境保全のため、アメリカに
おいてルール６６の適用、ドイツにおけるＴＡ−ＬＵＦ
Ｔの適用、さらに日本国内においても大阪府条例の発布
に見られるように塗料塗装時に排出される有機溶剤量の
削減が必須要件となっている。現在、例えば２輪車の外
板用塗料の塗装焼付方法は、着色顔料及びメタリック顔
料を配合した熱硬化性エナメル塗料（以下、この塗料を
「ベースコート」と略称する）を塗装した後、熱硬化性
クリヤー塗料を塗装し、その後加熱硬化して両塗膜を同
時に硬化せしめる２コート１べーク方式（以下、「２Ｃ
１Ｂ方式」と略称する）が採用されている。このベース
コートは、塗装時に排出される有機溶剤量の削減のため
溶剤型塗料から水分散型塗料（以下、この塗料を「水系
ベースコート」と略称する）への変換が進められてい
る。しかしながらこの水系ベースコートは上塗り塗料と
しての厳しい色調性・外観性がもとめられるため、化成
処理鋼板、亜鉛系合金メッキ鋼板上に塗装・焼付した場
合の防錆力を付与できないのが現状である。２輪車の外
板部に使用されているリン酸亜鉛化成処理鋼板上に水系
ベースコートと熱硬化性クリヤー塗料を塗装・焼付した
場合の塗膜物性は、耐食性のレベルが低く実用に耐え得
るものではない。そのため、リン酸亜鉛化成処理鋼板上
に水系ベースコートを塗装する場合、防錆力を付与した
下塗り塗料をあらかじめリン酸亜鉛化成処理鋼板上に塗
装する工程が必須となる。通常の場合、この下塗り塗料
にはカチオン型電着塗料が使用される。要するに、リン
酸亜鉛化成処理鋼板上にカチオン型電着塗料を塗装・焼
付した後に水系ベースコートと、熱硬化性クリヤー塗料
を塗装・焼付を行う３コート２ベーク方式（以下、「３
Ｃ２Ｂ方式」と略称する）が採用されている。この工程
からなる塗膜は、機械的性質、耐候性、耐食性などの塗
膜物性と仕上がり外観、色調が非常に優れている。また
カチオン型電着塗料は水分散型塗料であり、塗装時に排
出される有機溶剤量も非常に少ない。2. Description of the Related Art In recent years, in order to protect the global environment, the application of rule 66 in the United States and TA-LUF in Germany
It is an essential requirement to apply T and to reduce the amount of organic solvent discharged at the time of paint application as seen in the Osaka Prefecture Ordinance issued in Japan. At present, for example, a paint baking method of a paint for an outer panel of a motorcycle is to apply a thermosetting enamel paint containing a color pigment and a metallic pigment (hereinafter, this paint is abbreviated as a “base coat”) and then to apply a thermosetting paint. A two-coat, one-bake system (hereinafter referred to as "2C
1B system "). This base coat is being converted from a solvent-based paint to a water-dispersed paint (hereinafter, this paint is abbreviated as “water-based base coat”) in order to reduce the amount of organic solvent discharged during painting. However, since this water-based base coat is required to have severe color tone and appearance as a top coat, it cannot presently impart a rust preventive force when applied and baked on chemical conversion-treated steel sheets and zinc-based alloy-plated steel sheets. When a water-based base coat and a thermosetting clear paint are applied and baked on a zinc phosphate conversion-treated steel sheet used for the outer panel of motorcycles, the coating properties are low and have a low level of corrosion resistance and can withstand practical use. is not. Therefore, in the case of applying a water-based base coat on a zinc phosphate chemical conversion treated steel sheet, a step of applying an undercoat paint having a rust-preventive force on the zinc phosphate chemical conversion treated steel sheet in advance is essential. Usually, a cationic electrodeposition coating is used as the undercoat. In short, a three-coat two-bake method (hereinafter referred to as "3") in which a cationic base electrodeposition paint is coated and baked on a zinc phosphate chemical conversion-treated steel sheet, and then a water-based base coat and a thermosetting clear paint are applied and baked.
C2B system "). The coating film formed by this process has extremely excellent coating film physical properties such as mechanical properties, weather resistance and corrosion resistance, and a finished appearance and color tone. Further, the cationic electrodeposition paint is a water-dispersed paint, and the amount of organic solvent discharged at the time of painting is very small.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、下塗り
としてカチオン型電着塗料を塗装・焼付するため、上塗
り工程を含めると塗装・焼付ラインを２回通過させなけ
ればならず、生産性の面で大きな障害となる。さらにカ
チオン型電着塗料の塗装・焼付ラインは膨大な設備投資
が必要であり大幅なコストアップとなる。これらの短所
があるため、リン酸亜鉛化成処理鋼板上にカチオン型電
着塗料を塗装・焼付した上に水系ベースコートと、熱硬
化性クリヤー塗料を塗装・焼付を行う３Ｃ２Ｂ方式での
方法に替わる１回焼付の新規な塗装・焼付方法の開発が
急務である。そこで本発明は、塗装時に排出される有機
溶剤を削減し、仕上がり外観性、耐食性、などを塗膜物
性低下させることなく、さらに塗装・焼付工程短縮化を
可能とすることを目的とするものである。However, since the cationic electrodeposition paint is applied and baked as an undercoat, if the overcoating step is included, the paint must be passed twice through the painting and baking line, which is a major factor in terms of productivity. It is an obstacle. In addition, the cation-type electrodeposition paint painting and baking line requires enormous capital investment, resulting in a significant cost increase. Due to these disadvantages, there is an alternative to a 3C2B method in which a cationic electrodeposition paint is applied and baked on a zinc phosphate conversion-treated steel sheet, and then an aqueous base coat and a thermosetting clear paint are applied and baked. There is an urgent need to develop a new coating and printing method for reprinting. Therefore, the present invention aims to reduce the amount of organic solvent discharged during painting, and to further reduce the painting and baking process without reducing the finished appearance, corrosion resistance, etc., of the coating film properties. is there.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、カチオン
型電着塗料の塗装・焼付に代えて、水分散型防錆プライ
マー塗料を工程に組み入れることにより、３コート１ベ
ーク方式（以下、「３Ｃ１Ｂ方式」と略称する）での塗
装・焼付方法にて、塗装時に排出される有機溶剤を削減
し、外観、耐食性などを塗膜物性を低下させることな
く、工程を短縮化することを可能とした。この知見に基
づいて本発明を完成するに至った。Means for Solving the Problems The present inventors have incorporated a water-dispersed rust-preventive primer coating into the process instead of applying and baking a cationic electrodeposition coating, whereby a three-coat, one-bake system (hereinafter, referred to as a baking method). The coating and baking method of "3C1B method") reduces the amount of organic solvent discharged at the time of coating and shortens the process without deteriorating the physical properties of the coating film, such as appearance and corrosion resistance. And Based on this finding, the present invention has been completed.
【０００５】すなわち、本発明は化成処理を施した鋼板
もしくは亜鉛系合金メッキ鋼板（Ａ）上に水分散型防錆
プライマー塗料（Ｂ）を塗装した後、加温して塗着固形
分を８０％以上とした後、水分散型２液イソシアネート
硬化ベースコート塗料（Ｃ）を塗装した後、加温して塗
着固形分を８０％以上とし、さらにその後イソシアネー
ト硬化型アクリルウレタン塗料（Ｄ）を塗装し、上記塗
料（Ｂ）、（Ｃ）および（Ｄ）の塗膜を同時に４０℃以
上で乾燥させて架橋硬化せしめるようにしたことを特徴
とする塗装方法に関する。That is, according to the present invention, a water-dispersed rust-preventive primer coating (B) is applied to a steel sheet or a zinc-based alloy-plated steel sheet (A) which has been subjected to a chemical conversion treatment and then heated to reduce the applied solid content to 80%. % Or more, then apply a water-dispersed two-pack isocyanate-cured base coat paint (C), and then heat to make the applied solid content 80% or more, and then apply an isocyanate-curable acrylic urethane paint (D). The present invention also relates to a coating method characterized in that the coating films of the paints (B), (C) and (D) are simultaneously dried at 40 ° C. or more to crosslink and cure.
【０００６】[0006]
【発明の実施の形態】まず、前記本発明に使用される各
成分について説明する。前記本発明の鋼板もしくは亜鉛
系合金メッキ鋼板（Ａ）は、表面にリン酸亜鉛・リン酸
鉄等の化成処理を施した板材が挙げられる。この板材の
表面に化成処理を施す工程は、ディップ・シャワーのど
ちらでもよい。First, each component used in the present invention will be described. Examples of the steel sheet or the zinc-based alloy-plated steel sheet (A) of the present invention include a sheet material whose surface has been subjected to a chemical conversion treatment such as zinc phosphate and iron phosphate. The step of subjecting the surface of the plate to the chemical conversion treatment may be either dip or shower.
【０００７】前記本発明の水分散型防錆プライマー塗料
（Ｂ）は、水分散型塗料であることが必須である。但
し、水分散の形態は、エマルション、コロイダルディス
パーションのどちらでもよい。It is essential that the water-dispersed rust-preventive primer coating (B) of the present invention is a water-dispersed coating. However, the form of water dispersion may be either emulsion or colloidal dispersion.
【０００８】前記本発明の水分散型２液イソシアネート
硬化ベースコート塗料（Ｃ）は、主剤がイソシアネート
との反応可能な官能基である−ＯＨ基を有する水分散型
塗料であることが必須である。但し、水分散の形態はエ
マルション、コロイダルディスパーションのどちらでも
よい。また、硬化剤としてはポリイソシアネート化合物
が用いられる。これら主剤と硬化剤とを所定の割合で混
合して使用する。It is essential that the water-dispersible two-pack isocyanate-cured base coat paint (C) of the present invention is a water-dispersible paint having a —OH group, which is a functional group capable of reacting with isocyanate. However, the form of the aqueous dispersion may be either an emulsion or a colloidal dispersion. In addition, a polyisocyanate compound is used as a curing agent. These main components and the curing agent are mixed and used at a predetermined ratio.
【０００９】前記本発明のイソシアネート硬化型アクリ
ルウレタン塗料（Ｄ）は、主剤がイソシアネートとの反
応可能な官能基である−ＯＨ基を有する溶液型塗料であ
り、樹脂組成はアクリル樹脂である。そして、硬化剤は
前述のポリイソシアネート化合物である。主剤と硬化剤
を所定の割合で混合して使用する。The isocyanate-curable acrylic urethane paint (D) of the present invention is a solution-type paint in which the main component has a —OH group which is a functional group capable of reacting with isocyanate, and the resin composition is an acrylic resin. The curing agent is the aforementioned polyisocyanate compound. The main agent and the curing agent are mixed and used at a predetermined ratio.
【００１０】次に、前記本発明の塗装方法を構成する各
工程を説明する。前述の化成処理を施した鋼板もしくは
亜鉛系合金メッキ鋼板（Ａ）上に、前述の水分散型防錆
プライマー塗料（Ｂ）を塗装した後、加温して塗着固形
分を８０％以上とする。この工程において、ｏｉｌ ｉ
ｎ ｗａｔｅｒ型のエマルション或いはコロイダルディ
スパーションであった塗料（Ｂ）の塗膜が、加温によっ
てｗａｔｅｒｉｎ ｏｉｌ型に相転移する。換言する
と、この工程では塗料（Ｂ）の塗膜中において、ｏｉｌ
ｉｎ ｗａｔｅｒからｗａｔｅｒ ｉｎ ｏｉｌへの
相転移を起こさせる加温処理を被塗装物に施すものであ
る。塗着固形分が８０％以上になるように加温した場
合、上記の相移転が十分に起こっているため、その後、
その上面に水分散型の塗料（Ｃ）を塗装しても問題は生
じない。しかし、塗着固形分が８０％未満となる加温で
は、相移転が十分には起こらないため、その後に塗料
（Ｃ）を塗装すると、塗料（Ｃ）中の水分によりプライ
マーである塗料（Ｂ）が溶解され、仕上がり外観性不良
の問題が生じる。したがって、前述の加温工程における
加温処理は、塗着固形分が８０％以上になるものであれ
ば良く、特にその方法を限定するものではない。例えば
工程の時間短縮のため、エアブローまたは熱風、あるい
は遠赤外線ランプによる加熱乾燥が好ましい。Next, each step constituting the coating method of the present invention will be described. After the above-mentioned water-dispersed rust-preventive primer paint (B) is applied on the steel sheet or the zinc-based alloy-plated steel sheet (A) subjected to the above-mentioned chemical conversion treatment, the coated solid content is increased to 80% or more by heating. I do. In this step, oil i
The coating film of the paint (B), which was an n-water type emulsion or colloidal dispersion, undergoes a phase transition to a water-in-oil type by heating. In other words, in this step, in the coating film of the paint (B), the oil
The object to be coated is subjected to a heating treatment for causing a phase transition from in water to water in oil. When heated so that the coating solid content is 80% or more, the above-mentioned phase transfer has sufficiently occurred.
There is no problem even if a water-dispersed paint (C) is applied on the upper surface. However, when the coating solid content is less than 80%, phase transfer does not sufficiently occur when the coating solid content is less than 80%. Therefore, when the coating material (C) is subsequently applied, the coating material (B ) Is dissolved, resulting in a problem of poor finished appearance. Therefore, the heating treatment in the above-mentioned heating step is not particularly limited as long as the solid content of coating is 80% or more. For example, in order to reduce the time of the process, it is preferable to dry by heating using air blow, hot air, or a far infrared lamp.
【００１１】さらに前述の塗料（Ｃ）を塗装した後、乾
燥して塗着固形分を８０％以上とする。この工程では、
前述の塗料（Ｃ）の塗膜の乾燥と同様に、塗料（Ｃ）の
塗膜中においてｏｉｌ ｉｎ ｗａｔｅｒからｗａｔｅ
ｒ ｉｎ ｏｉｌへの相転移を起こさせる乾燥処理を被
塗装物に施すものである。塗着固形分が８０％以上にな
るように乾燥した場合、相移転が十分に起こっているた
め、その後、その上面に（Ｄ）塗料を塗装しても問題は
生じない。しかし、塗着固形分が８０％未満となる乾燥
では、相移転が十分には起こらないため、その後塗料
（Ｄ）を塗装すると、仕上がり外観性不良の問題が生じ
る。したがって、この工程における加温処理は塗着固形
分が８０％以上になるものであれば良く、特にその方法
を限定するものではない。例えば工程の時間短縮のた
め、エアブローまたは熱風あるいは遠赤外線ランプによ
る加熱乾燥が好ましい。Further, after the above-mentioned paint (C) is applied, it is dried to make the applied solid content 80% or more. In this step,
In the same manner as the drying of the coating film of the paint (C), the oil in water is used for the coating of the paint (C).
The object to be coated is subjected to a drying treatment for causing a phase transition to rin oil. When the coating is dried so that the applied solid content is 80% or more, since phase transfer has sufficiently occurred, there is no problem even if the (D) paint is applied on the upper surface thereafter. However, in the drying in which the applied solid content is less than 80%, the phase transfer does not sufficiently occur. Therefore, when the paint (D) is applied thereafter, a problem of poor finished appearance occurs. Therefore, the heating treatment in this step is not particularly limited as long as the solid content of the coating is 80% or more. For example, in order to reduce the time of the process, it is preferable to dry by heating using air blow, hot air, or a far infrared ray lamp.
【００１２】その後、前述の塗料（Ｄ）を塗装し、前述
の塗料（Ｂ）、（Ｃ）および（Ｄ）の塗膜を同時に４０
℃以上で乾燥させ架橋硬化させる。この工程において、
塗料（Ｄ）の硬化はイソシアネート硬化であるため、室
温でも架橋反応するが、４０℃以上、特に６０〜８０℃
で３０分程度の強制乾燥が好ましい。Thereafter, the above-mentioned paint (D) is applied, and the paint films of the above-mentioned paints (B), (C) and (D) are simultaneously coated with 40 paints.
Dry at a temperature of at least ℃ and crosslink and cure. In this process,
Since the curing of the coating material (D) is an isocyanate curing, a crosslinking reaction occurs even at room temperature, but is 40 ° C. or more, particularly 60 to 80 ° C.
For about 30 minutes.
【００１３】[0013]
【作用】本発明の塗装方法は、塗装時に排出される有機
溶剤量を増量させることなく、塗装・乾燥工程を大幅に
削減可能ならしめることができる。さらに本発明によっ
て形成された塗膜の物性は、仕上がり外観性や耐食性な
どの塗膜物性を低下させることが全くない。According to the coating method of the present invention, the coating and drying steps can be greatly reduced without increasing the amount of organic solvent discharged during coating. Further, the physical properties of the coating film formed according to the present invention do not degrade the physical properties of the coating film such as finished appearance and corrosion resistance.
【００１４】[0014]
【実施例】次に実施例により本発明をさらに詳細に説明
するが、本発明はこれらの実施例によってなんら限定さ
れるものではない。なお、試験内容は下記のように評価
した。Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The test contents were evaluated as follows.
【００１５】（１）単位面積当たりの有機溶剤排出量
（ｇ／ｍ2 ）：各塗料における単位面積当たりの有機溶
剤排出量を下記の算出方法にて計算した。(1) Discharge amount of organic solvent per unit area (g / m 2 ): Discharge amount of organic solvent per unit area in each paint was calculated by the following calculation method.
【数１】 塗装系における単位面積当たりの有機溶剤総排出量は、
各塗料における単位面積当たりの有機溶剤排出量の合計
とし、６０ｇ／ｍ2 以下を○（合格）、６０ｇ／ｍ2 を
超える場合を×（不合格）とした。(Equation 1) The total organic solvent emission per unit area in the coating system is
The total amount of organic solvent discharged per unit area in each paint was defined as ○ (pass) when the amount was 60 g / m 2 or less, and × (fail) when the amount exceeded 60 g / m 2 .
【００１６】（２）耐食性（塩水噴霧試験）：乾燥後、
室温にて７２時間放置後の試験片を、新しいカッターナ
イフの先で塗膜の素地に達する２本の対角線を引く。塩
水噴霧試験装置（ＪＩＳ−Ｋ−５４００（１９９０）
９．１耐塩水噴霧性による）に固定し、塩化ナトリウム
５±１％水溶液をＪＩＳ−Ｋ−５４００（１９９０）
９．１耐塩水噴霧性の試験条件にて噴霧試験を実施し
た。３６０時間の試験を終えた試験片の塗面を清浄な流
水で洗浄し、室内にたてて２時間放置した。その後、Ｊ
ＩＳ−Ｋ−５４００（１９９０）８、５、３×カットテ
ープ法により対角線部のセロハン粘着テープ剥離試験を
実施する。ふくれ・剥離・発錆が対角線より片側２ｍｍ
以内のものを○（合格）、片側２ｍｍを超えるものを×
（不合格）とした。(2) Corrosion resistance (salt spray test): after drying
After leaving the test piece at room temperature for 72 hours, two diagonal lines reaching the base material of the coating film are drawn with the tip of a new cutter knife. Salt spray test equipment (JIS-K-5400 (1990)
9.1 according to salt spray resistance), and a 5 ± 1% aqueous solution of sodium chloride was applied to JIS-K-5400 (1990).
A spray test was performed under the test conditions of 9.1 salt water spray resistance. After the test for 360 hours, the coated surface of the test piece was washed with clean running water and left in a room for 2 hours. Then J
A diagonal cellophane adhesive tape peeling test is performed by an IS-K-5400 (1990) 8, 5, 3 x cut tape method. Blistering, peeling and rusting are 2 mm on one side from the diagonal line
Within: ○ (pass), those exceeding 2 mm on one side ×
(Failed).
【００１７】（３）仕上がり外観性：塗面状態を調べ
た。艶引け、光沢低下、アルミ動き発生、塗膜反転等の
欠陥のないものを○（合格）、塗面状態でこれらの欠陥
の見られるものを×（不合格）とした。(3) Finish appearance: The state of the coated surface was examined. A sample having no defects such as gloss reduction, gloss reduction, aluminum movement occurrence, and coating reversal was evaluated as ○ (pass), and a sample having these defects in the coated state was evaluated as x (fail).
【００１８】（４）生産性：焼付工程が１回（３Ｃ１
Ｂ、２Ｃ１Ｂ）であるものを○（合格）とし、２回以上
の焼付工程が必要であるもの（３Ｃ２Ｂ）を×（不合
格）とした。(4) Productivity: One baking process (3C1
B, 2C1B) were evaluated as ○ (pass), and those requiring two or more baking steps (3C2B) were evaluated as × (fail).
【００１９】［実施例１］まず、１５０×７０×０．８
ｍｍ鋼板に、リン酸亜鉛表面処理〔日本パーカライジン
グ（株）製パルボンドＬ３０２０、商品名〕を施した鋼
板（Ａ）上に、水分散型防錆プライマー塗料（Ｂ）〔日
本油脂（株）製アクア防錆プライマー、登録商標〕を乾
燥膜厚が１０μｍになるよう塗装した。その後、被塗装
物を遠赤外線乾燥炉（雰囲気温度７５℃設定）内に５分
間通過させ、水分散型防錆プライマー塗料（Ｂ）の塗着
固形分を８０％にした。その上に水分散型２液イソシア
ネート硬化ベースコート塗料（Ｃ）〔日本油脂（株）製
アクア２Ｋ−１シルバーメタリック、登録商標〕を乾燥
膜厚が１２μｍになるよう塗装した。その後、被塗装物
を遠赤外線乾燥炉（雰囲気温度７５℃設定）内に５分間
通過させ、水分散型２液イソシアネート硬化ベースコー
ト塗料（Ｃ）の塗着固形分を８０％にした。その上にイ
ソシアネート硬化型アクリルウレタン塗料（Ｄ）〔日本
油脂（株）製ハイウレタンＬＶ−７クリヤー、登録商
標〕を乾燥膜厚が２５μｍになるよう塗装した。室温で
５分間程度放置した後、７５℃で３０分間強制乾燥して
試験片を得た。[Embodiment 1] First, 150 × 70 × 0.8
water-dispersible rust-preventive primer paint (B) [Nippon Oil & Fat Co., Ltd.] on a steel sheet (A) which has been subjected to a zinc phosphate surface treatment [PALBOND L3020, trade name, manufactured by Nippon Parkerizing Co., Ltd.] Rust prevention primer, registered trademark] was applied to a dry film thickness of 10 μm. Thereafter, the object to be coated was passed through a far-infrared ray drying oven (atmospheric temperature set at 75 ° C.) for 5 minutes to reduce the applied solid content of the water-dispersed rust-preventive primer coating (B) to 80%. A water-dispersed two-liquid isocyanate-cured base coat paint (C) [Aqua 2K-1 Silver Metallic, trade name, manufactured by NOF Corporation] was applied thereon so that the dry film thickness became 12 μm. Thereafter, the object to be coated was passed through a far-infrared ray drying oven (atmospheric temperature set at 75 ° C.) for 5 minutes, so that the solid content of the water-dispersed two-liquid isocyanate-cured base coat paint (C) was 80%. An isocyanate-curable acrylic urethane paint (D) (trade name of Hi-Urethane LV-7 Clear, manufactured by NOF Corporation) was applied thereon so that the dry film thickness became 25 μm. After leaving it at room temperature for about 5 minutes, it was forcibly dried at 75 ° C. for 30 minutes to obtain a test piece.
【００２０】［実施例２］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、前記実施例１と同じ水分散
型防錆プライマー塗料（Ｂ）、水分散型２液イソシアネ
ート硬化ベースコート塗料（Ｃ）及びイソシアネート硬
化型アクリルウレタン塗料（Ｄ）を塗装するが、水分散
型防錆プライマー塗料（Ｂ）及び水分散型２液イソシア
ネート硬化ベースコート塗料（Ｃ）の各加温処理を共に
７５℃で１０分間通過させ、それぞれ塗着固形分を９５
％とした。他の工程は前記実施例１と同一とした。[Example 2] The same water-dispersible rust-preventive primer coating (B) and water-dispersible two-part isocyanate curing as in Example 1 were applied on the same zinc phosphate conversion-treated steel sheet (A) as in Example 1 above. The base coat paint (C) and the isocyanate-curable acrylic urethane paint (D) are applied, and the respective heating treatments of the water-dispersed rust-preventive primer paint (B) and the water-dispersed two-pack isocyanate-cured base coat paint (C) are performed together. Pass at 75 ° C. for 10 minutes, and apply a solid content of 95% each.
%. Other steps were the same as those in the first embodiment.
【００２１】［実施例３］まず、１５０×７０×０．８
ｍｍの溶融亜鉛メッキ鋼板〔新日本製鉄（株）製シルバ
ージンク、商品名〕を施した鋼板（Ａ）上に、水分散型
防錆プライマー塗料（Ｂ）〔日本油脂（株）製アクア防
錆プライマー、登録商標〕を乾燥膜厚が１０μｍになる
よう塗装した。その後、被塗装物を遠赤外線乾燥炉（雰
囲気温度７５℃設定）内に７分間通過させ、水分散型防
錆プライマー塗料（Ｂ）の塗着固形分を８５％にした。
その上に水分散型２液イソシアネート硬化ベースコート
塗料（Ｃ）〔日本油脂（株）製アクア２Ｋ−１シルバー
メタリック、登録商標〕を乾燥膜厚が１２μｍになるよ
う塗装した。その後、被塗装物を遠赤外線乾燥炉（雰囲
気温度７５℃設定）内に７分間通過させ、水分散型２液
イソシアネート硬化ベースコート塗料（Ｃ）の塗着固形
分を８０％にした。その上にイソシアネート硬化型アク
リルウレタン塗料（Ｄ）〔日本油脂（株）製ハイウレタ
ンＬＶ−７クリヤー、登録商標〕を乾燥膜厚が２５μｍ
になるよう塗装する。室温で５分間程度放置した後、７
５℃で３０分間強制乾燥して試験片を得た。[Embodiment 3] First, 150 × 70 × 0.8
water-dispersed rust-preventive primer coating (B) [Aqua Rust Prevention manufactured by Nippon Oil & Fats Co., Ltd.] on a steel plate (A) coated with a hot-dip galvanized steel sheet [Silver zinc, trade name, manufactured by Nippon Steel Corporation]. Primer, registered trademark] was applied to a dry film thickness of 10 μm. Thereafter, the object to be coated was passed through a far-infrared ray drying oven (atmospheric temperature set at 75 ° C.) for 7 minutes to make the applied solid content of the water-dispersed rust-preventive primer coating material (B) 85%.
A water-dispersed two-liquid isocyanate-cured base coat paint (C) [Aqua 2K-1 Silver Metallic, trade name, manufactured by NOF Corporation] was applied thereon so that the dry film thickness became 12 μm. Thereafter, the object to be coated was passed through a far-infrared ray drying oven (atmospheric temperature set at 75 ° C.) for 7 minutes to reduce the applied solid content of the water-dispersed two-liquid isocyanate-cured base coat paint (C) to 80%. An isocyanate-curable acrylic urethane paint (D) (trade name: Hiurethane LV-7 Clear, manufactured by NOF Corporation) having a dry film thickness of 25 μm
Paint so that it becomes. After leaving at room temperature for about 5 minutes,
A test piece was obtained by forcibly drying at 5 ° C. for 30 minutes.
【００２２】［比較例１］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、前記実施例１と同じ水分散
型防錆プライマー塗料（Ｂ）、水分散型２液イソシアネ
ート硬化ベースコート塗料（Ｃ）及びイソシアネート硬
化型アクリルウレタン塗料（Ｄ）を塗装するが、水分散
型防錆プライマー塗料（Ｂ）及び水分散型２液イソシア
ネート硬化ベースコート塗料（Ｃ）の各加温処理を省略
し、それぞれ塗着固形分を４０％とした。他の工程は前
記実施例１と同一とした。Comparative Example 1 The same water-dispersible rust-preventive primer coating (B) and water-dispersible two-liquid isocyanate curing as in Example 1 were applied to the same zinc phosphate chemical conversion-treated steel sheet (A) as in Example 1. Apply base coat paint (C) and isocyanate-curable acrylic urethane paint (D), but omit each heating treatment of water-dispersed rust-preventive primer paint (B) and water-dispersed two-pack isocyanate-cured base coat paint (C) The coating solid content was set to 40%. Other steps were the same as those in the first embodiment.
【００２３】［比較例２］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、前記実施例１と同じ水分散
型防錆プライマー塗料（Ｂ）、水分散型２液イソシアネ
ート硬化ベースコート塗料（Ｃ）及びイソシアネート硬
化型アクリルウレタン塗料（Ｄ）を塗装するが、水分散
型防錆プライマー塗料（Ｂ）については加温処理を前記
実施例１と同様に７５℃で５分間通過させ、塗着固形分
を８０％としたものの、水分散型２液イソシアネート硬
化ベースコート塗料（Ｃ）については加温処理を省略
し、塗着固形分を４０％とした。他の工程は前記実施例
１と同一とした。Comparative Example 2 The same water-dispersible rust-preventive primer paint (B) and water-dispersible two-part isocyanate curing as in Example 1 were applied to the same zinc phosphate chemical conversion-treated steel sheet (A) as in Example 1. The base coat paint (C) and the isocyanate-curable acrylic urethane paint (D) are applied. The water-dispersed rust-preventive primer paint (B) is heated at 75 ° C. for 5 minutes in the same manner as in Example 1 above. Although the coating solid content was 80%, the heating treatment was omitted for the water-dispersed two-pack isocyanate-cured base coat paint (C), and the coating solid content was 40%. Other steps were the same as those in the first embodiment.
【００２４】［比較例３］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、前記実施例１と同じ水分散
型防錆プライマー塗料（Ｂ）、水分散型２液イソシアネ
ート硬化ベースコート塗料（Ｃ）及びイソシアネート硬
化型アクリルウレタン塗料（Ｄ）を塗装するが、水分散
型防錆プライマー塗料（Ｂ）については加温処理を省略
し、塗着固形分を４０％とした。水分散型２液イソシア
ネート硬化ベースコート塗料（Ｃ）については加温処理
を前記実施例１と同様に７５℃で５分間通過させ、塗着
固形分を８０％とした。他の工程は前記実施例１と同一
とした。Comparative Example 3 The same water-dispersible rust-preventive primer paint (B) and water-dispersible two-pack isocyanate curing as in Example 1 were applied on the same zinc phosphate chemical conversion-treated steel sheet (A) as in Example 1. The base coat paint (C) and the isocyanate-curable acrylic urethane paint (D) were applied, but the heating treatment was omitted for the water-dispersed rust-preventive primer paint (B), and the applied solid content was 40%. The water-dispersed two-pack isocyanate-cured base coat paint (C) was passed through a heating treatment at 75 ° C. for 5 minutes in the same manner as in Example 1 so that the applied solid content was 80%. Other steps were the same as those in the first embodiment.
【００２５】［比較例４］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、前記実施例１と同じ水分散
型防錆プライマー塗料（Ｂ）、水分散型２液イソシアネ
ート硬化ベースコート塗料（Ｃ）及びイソシアネート硬
化型アクリルウレタン塗料（Ｄ）を塗装するが、水分散
型防錆プライマー塗料（Ｂ）及び水分散型２液イソシア
ネート硬化ベースコート塗料（Ｃ）の各加温処理を共に
７５℃で２分間通過させ、それぞれ塗着固形分を７０％
とした。他の工程は前記実施例１と同一とした。Comparative Example 4 The same water-dispersible rust-preventive primer coating (B) and water-dispersible two-pack isocyanate curing as in Example 1 were applied on the same zinc phosphate chemical conversion-treated steel sheet (A) as in Example 1. The base coat paint (C) and the isocyanate-curable acrylic urethane paint (D) are applied, and the respective heating treatments of the water-dispersed rust-preventive primer paint (B) and the water-dispersed two-pack isocyanate-cured base coat paint (C) are performed together. Passed at 75 ° C for 2 minutes, each coating solid content 70%
And Other steps were the same as those in the first embodiment.
【００２６】［比較例５］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、下塗り塗料として水分散型
防錆プライマー塗料（Ｂ）を塗装しないでカチオン型電
着塗料〔日本油脂（株）製アクア−ＥＣ４２００、登録
商標〕を乾燥膜厚が１８μｍになるよう塗装した。その
後、被塗装物を１７５℃で３０分間焼付けた。その後の
上塗り塗料〔水分散型２液イソシアネート硬化ベースコ
ート塗料（Ｃ）及びイソシアネート硬化型アクリルウレ
タン塗料（Ｄ）〕については前記実施例１と同じ塗料を
塗装し、塗装・加温処理・強制乾燥工程も前記実施例１
と同一とした。[Comparative Example 5] On the same zinc phosphate chemical conversion treated steel sheet (A) as in Example 1 above, a water-dispersible rust-preventive primer paint (B) was not applied as an undercoat paint, but a cationic electrodeposition paint [Japan AQUA-EC4200, manufactured by Yushi Co., Ltd.] was applied so that the dry film thickness became 18 μm. Thereafter, the object was baked at 175 ° C. for 30 minutes. Then, the same top coat as in Example 1 was applied to the top coat paint (water-dispersed two-pack isocyanate-cured base coat paint (C) and isocyanate-cured acrylic urethane paint (D)), followed by painting, heating, and forced drying. Example 1
And the same.
【００２７】［比較例６］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、下塗り塗料として水分散型
防錆プライマー塗料（Ｂ）を塗装しないで剤型防錆プラ
イマー塗料〔日本油脂（株）製エピコ防錆プライマー、
登録商標〕を乾燥膜厚が１５μｍになるよう塗装した。
その後の上塗り塗料〔水分散型２液イソシアネート硬化
ベースコート塗料（Ｃ）及びイソシアネート硬化型アク
リルウレタン塗料（Ｄ）〕については前記実施例１と同
じ塗料を塗装し、塗装・加温処理・強制乾燥工程も前記
実施例１と同一とした。Comparative Example 6 A water-dispersed rust-preventive primer paint (B) was not applied as an undercoat on the same zinc phosphate chemical conversion-treated steel sheet (A) as in the above-mentioned Example 1; Epico Rust Prevention Primer, manufactured by NOF Corporation,
(Registered trademark)] was applied to a dry film thickness of 15 μm.
Then, the same top coat as in Example 1 was applied to the top coat paint (water-dispersed two-pack isocyanate-cured base coat paint (C) and isocyanate-cured acrylic urethane paint (D)), followed by painting, heating, and forced drying. The same as in the first embodiment.
【００２８】［比較例７］前記実施例１と同じリン酸亜
鉛化成処理鋼板（Ａ）上に、下塗り塗料として水分散型
防錆プライマー塗料（Ｂ）を塗装しないで、リン酸亜鉛
化成処理鋼板（Ａ）上に直接、前記実施例１と同じ上塗
り塗料〔水分散型２液イソシアネート硬化ベースコート
塗料（Ｃ）及びイソシアネート硬化型アクリルウレタン
塗料（Ｄ）〕を塗装し、塗装・加温処理・強制・乾燥工
程も前記実施例１と同一とした。Comparative Example 7 A zinc phosphate chemical conversion-treated steel sheet was applied on the same zinc phosphate chemical conversion-treated steel sheet (A) as in Example 1 without applying a water-dispersed rust-preventive primer paint (B) as an undercoat. (A) is directly coated with the same overcoat paint (water-dispersible two-pack isocyanate-curable base coat paint (C) and isocyanate-curable acrylic urethane paint (D)) as in Example 1 above, and is painted, heated and forced. -The drying process was the same as that in Example 1.
【００２９】前記実施例１〜３及び比較例１〜７に用い
た各塗料の特性値（単位面積当たりの有機溶剤排出量、
乾燥膜厚、乾燥塗膜比重、希釈塗料中の有機溶剤重量、
希釈塗料中の固形分量、塗着効率）を表１に示した。The characteristic values of the paints used in Examples 1 to 3 and Comparative Examples 1 to 7 (the amount of organic solvent discharged per unit area,
Dry film thickness, dry film specific gravity, organic solvent weight in diluted paint,
The solid content in the diluted paint and the coating efficiency) are shown in Table 1.
【表１】 [Table 1]
【００３０】前記実施例１〜３及び比較例１〜７に用い
た塗料種類、加温処理条件、加温処理後の塗着固形分、
強制乾燥条件、加温処理後の塗着固形分を表２に示し
た。The types of coatings used in Examples 1 to 3 and Comparative Examples 1 to 7, heating conditions, solids content after heating,
Table 2 shows the coating solid content after the forced drying conditions and the heating treatment.
【表２】 [Table 2]
【００３１】前記実施例１〜３及び比較例１〜７につい
て、前述の（１）単位面積当たりの有機溶剤総排出量
（ｇ／ｍ2 ）、（２）耐食性（塩水噴霧試験）、（３）
仕上がり外観性、（４）生産性の各試験を行なった結果
を表３に示した。For Examples 1 to 3 and Comparative Examples 1 to 7, (1) the total amount of organic solvent discharged per unit area (g / m 2 ), (2) corrosion resistance (salt spray test), (3) )
Table 3 shows the results of each test of finished appearance and (4) productivity.
【表３】 [Table 3]
【００３２】表３から明らかなように、本発明の塗装方
法では、３Ｃ１Ｂの生産方式にて排出される単位面積当
たりの有機溶剤総量は６０ｇ／ｍ2 以下であり、仕上が
り外観・耐食性においても満足した結果を示しており、
本発明が優れていることが確認された。As is apparent from Table 3, in the coating method of the present invention, the total amount of organic solvent discharged per unit area in the 3C1B production method is 60 g / m 2 or less, and the finished appearance and corrosion resistance are satisfactory. Shows the results of
It was confirmed that the present invention was excellent.
【００３３】これに対して、比較例１〜４では水分散型
防錆プライマー塗料（Ｂ）、水分散型２液イソシアネー
ト硬化ベースコート塗料（Ｃ）の塗装後の各加温処理の
何れか一方もしくは両方が省略されたため、塗着固形分
８０％以上を満足しない。このため水分散型防錆プライ
マー塗料（Ｂ）と水分散型２液イソシアネート硬化ベー
スコート塗料（Ｃ）との間、もしくは水分散型２液イソ
シアネート硬化ベースコート塗料（Ｃ）とイソシアネー
ト硬化型アクリルウレタン塗料（Ｄ）との間（界面）で
塗料が入り混じり、仕上がり塗膜の光沢が低下したり、
光輝剤の配向が乱れて「メタルムラ」が発生した。比較
例５は、下塗り塗料として水分散型防錆プライマー塗料
（Ｂ）でなくカチオン型電着塗料を使用した３Ｃ２Ｂ方
式の塗装方法である。この比較例５では、有機溶剤総排
出量・仕上がり外観性・耐食性等については実施例と同
じ結果を示したが、カチオン型電着塗料の１７５℃で３
０分焼付工程が必要であるため、生産性は低く、生産コ
ストは上昇する。比較例６は、下塗り塗料として水分散
型防錆プライマー塗料（Ｂ）でなく溶剤型防錆プライマ
ー塗料を使用した塗装方法である。この比較例６では、
溶剤型防錆プライマー塗料から排出される単位面積当た
りの有機溶剤量が７０．０ｇ／ｍ 2 であるため、塗装系
総量では、１２０．６ｇ／ｍ2 となり非常に多くの有機
溶剤が排出された。比較例７は、下塗り塗料を全く塗装
せず、リン酸亜鉛処理鋼板（Ａ）上に直接上塗り塗料
〔水分散型２液イソシアネート硬化ベースコート塗料
（Ｃ）及びイソシアネート硬化型アクリルウレタン塗料
（Ｄ）〕を塗装した塗装方法である。この比較例７で
は、耐食性（塩水噴霧試験）３６０時間後の試験片の剥
離試験結果が、片側５ｍｍ剥離発生し、実用に耐え得る
ものではない。On the other hand, in Comparative Examples 1 to 4,
Anti-rust primer paint (B), water-dispersed two-pack isocyanate
Of each heating treatment after the application of the cured base coat paint (C)
Because one or both are omitted, the solid content
Not satisfy 80% or more. For this reason, water-dispersed rust-preventive ply
Paint (B) and water-dispersible two-pack isocyanate-cured base
Between the Scoat paint (C) or water-dispersed two-component iso
Cyanate-cured base coat paint (C) and isocyanate
Between (curing) and the acrylic urethane paint (D)
Paint mixed in, the gloss of the finished coating film decreased,
"Metal unevenness" occurred due to the disorder of the orientation of the brightener. Comparison
Example 5 is a water-dispersed rust-preventive primer paint as an undercoat paint.
3C2B using cationic electrodeposition paint instead of (B)
It is a painting method of the formula. In Comparative Example 5, the organic solvent
Output, finish appearance, corrosion resistance, etc. are the same as in the example.
At 175 ° C for the cationic electrodeposition paint.
Since a 0 minute baking process is required, productivity is low, and
The strike rises. Comparative Example 6 was prepared by dispersing in water as an undercoat paint.
Solvent-based rust-preventive primer instead of type-based rust-proof primer coating (B)
-This is a coating method using paint. In Comparative Example 6,
Unit area discharged from solvent type rust preventive primer paint
Of organic solvent is 70.0 g / m Two Because it is a paint system
120.6 g / m2 in totalTwo So much organic
Solvent was discharged. In Comparative Example 7, the undercoat was completely applied.
No direct coating on zinc phosphate treated steel sheet (A)
[Water-dispersed two-pack isocyanate-cured base coat paint
(C) and isocyanate-curable acrylic urethane paint
(D)]. In Comparative Example 7,
Is the peeling of the test piece after 360 hours of corrosion resistance (salt spray test)
Release test result, 5 mm peeling on one side occurred, and it can be put to practical use
Not something.
【００３４】[0034]
【発明の効果】以上説明したように本発明の塗装方法
は、カチオン型電着塗料塗装・焼付に替わり、水分散型
防錆プライマー塗料を工程に組み入れることにより、３
Ｃ１Ｂ方式の塗装焼付方法にて、塗装時に排出される有
機溶剤を削減し、外観、耐食性、耐候性など塗膜物性を
低下させることなく、工程の短縮化を可能ならしめるも
のである。そして、今後、地球環境保全のため、塗料塗
装時に排出される有機溶剤量の削減が必須要件となり、
該塗装方法は、耐食性が必要な部品に長大な設備を必要
としないで、優れた仕上がり外観を付与する有効な方法
である。As described above, the coating method of the present invention can be achieved by incorporating a water-dispersed rust-preventive primer coating into the process instead of the cationic electrodeposition coating coating and baking.
By the coating baking method of the C1B method, the organic solvent discharged at the time of coating is reduced, and the process can be shortened without deteriorating the physical properties of the coating film such as appearance, corrosion resistance and weather resistance. In the future, in order to protect the global environment, reducing the amount of organic solvents emitted during paint coating will be an essential requirement.
The coating method is an effective method for providing an excellent finished appearance without requiring a long facility for parts requiring corrosion resistance.
フロントページの続き (72)発明者 望月 信介 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 (72)発明者 小林 昭仁 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内Continued on the front page (72) Inventor Shinsuke Mochizuki 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Inventor Akihito Kobayashi 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Honda Technical Research Institute
Claims (1)
金メッキ鋼板（Ａ）上に水分散型防錆プライマー塗料
（Ｂ）を塗装した後、加温して塗着固形分を８０％以上
とした後、水分散型２液イソシアネート硬化ベースコー
ト塗料（Ｃ）を塗装した後、加温して塗着固形分を８０
％以上とし、さらにその後イソシアネート硬化型アクリ
ルウレタン塗料（Ｄ）を塗装し、塗料（Ｂ）、（Ｃ）お
よび（Ｄ）の塗膜を同時に４０℃以上で乾燥させて架橋
硬化せしめるようにしたことを特徴とする塗装方法。1. A water-dispersed rust-preventive primer paint (B) is applied on a steel sheet or a zinc-based alloy-plated steel sheet (A) which has been subjected to a chemical conversion treatment, and then heated to a solid content of 80% or more. After that, a water-dispersed two-pack isocyanate-cured base coat paint (C) was applied and then heated to reduce the applied solid content to 80%.
% Or more, and thereafter, an isocyanate-curable acrylic urethane paint (D) is applied, and the paint films (B), (C) and (D) are simultaneously dried at 40 ° C. or more to be crosslinked and cured. A coating method characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04748397A JP3969462B2 (en) | 1997-03-03 | 1997-03-03 | Painting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04748397A JP3969462B2 (en) | 1997-03-03 | 1997-03-03 | Painting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10244210A true JPH10244210A (en) | 1998-09-14 |
| JP3969462B2 JP3969462B2 (en) | 2007-09-05 |
Family
ID=12776384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04748397A Expired - Fee Related JP3969462B2 (en) | 1997-03-03 | 1997-03-03 | Painting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3969462B2 (en) |
-
1997
- 1997-03-03 JP JP04748397A patent/JP3969462B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3969462B2 (en) | 2007-09-05 |
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